| China has been entered a stage of rapid industrialization, whose steel industry development rapidly and demand for iron ore in a rapid growth trend. However, iron ore resources of China is relatively poor, and whose development of is extended rapidly and extensively, as well as the serious shortage of reserve resources, the iron ore resources of China have been increasingly severed. Therefore, accelerating the exploration and research of iron ore, searching for and developing new iron mineral resources in potential is an urgent task currently, as well as a fundamental solution to the shortage of iron ore resources of China. It has a great practical significance for the sustainable development of the mineral resources in China. Huili-Zhuqing V-Ti magnetite deposit was discovered in 2005, which was located in Zhuqing Village, Huili County, Liangshan State, Sichuan Province. The initial exploration showed that it was a large scale vanadium-titanium magnetite deposit in 2012. And it was in the western edge of the Yangtze plate, Panxi Rift palaeohigh band together with the three mines:Panzhihua, Baima and Taihe. For the lack of preliminary groundwork and process mineralogy of that ores, the deposit has not been exploited. The Chemical titration analysis, ICP-MS, AAS, XRF, Optical microscope, XRD, SEM-EDS, EPMA and MLA were employed for the process mineralogy research of Huili-Zhuqing V-Ti magnetite in this paper, such as the chemical and mineral compositions, texture and structure, mineralogical characteristics, occurrence and distribution of major elements, the physical properties of the ore minerals, the magnetic separation and direction reduction of iron concentrate and so on. The research results can provide basic datum and evidences for the beneficiation technology of the Huili-Zhuqing V-Ti magnetite deposit in the future.The main chemical composition of the ore was consisted of Fe, Ti, V, Cr, Mn, Co, Ni, S, etc. The ore comprises of various minerals such as titanium magnetite, ilmenite, pyrite, chalcopyrite, gangue minerals, etc. The chemical composition and ore comprises of Huili-Zhuqing V-Ti magnetite deposit were similar with those of the four mines:Panzhihua, Baima, Taihe and Hongge, but there was still some differences in content.The mineral particles were mainly presented as subhedral-anhedral. And the minerals comprise of embedded crystal texture, sideronitic texture, exsolution texture and metasomatic relict texture. The disseminated structures was the the mainly structure of ore.The titanium magnetite was disseminated in the gangue minerals with subhedral-anhedral crystal texture and characteristics of solid solution separation structure, and it was the major carrier of ilmenite solid solution that mainly comprised of lath and platelet ilmenite. Ilmenite was also presents as subhedral-anhedral in the ore with Ti-magnetite intimately, and the platelet crystalline Ti-magnetite scattered in the ilmenite dispersively. Pyrite, chalcopyrite, sphalerite and galena were the major minerals in sulfides, which were filled in the gangue minerals as anhedral granula.The occurrences of main elements in ores were different. Fe usually existed in Ti-magnetite and ilmenite as independent mineral. Ti mainly existed in ilmenite, which holds a distribution rate of 56.617%. And 36.636% Ti existed in the Ti-magnetite as isomorphism. V, Cr and Mn mainly existed in the Ti-magnetite as isomorphism. Co and Ni mainly existed in sulfides, and apart of small amount existed in Ti-magnetite and ilmenite as isomorphism. S mainly existed in sulfides. Ca, Mg, Al and Si were the mainly composition of gangue minerals.Titanium magnetite was ferromagnetic minerals, the ilmenite and pyrite were weakly magnetic minerals, and the gangue minerals were non-magnetic minerals. Therefore, the titanomagnetite could be sorted and recycled by weak magnetic separation firstly, and then the ilmenite and pyrite (sulfide) could be separated from the gangue minerals with strong magnetic separation. The density of titanium magnetite, ilmenite and pyrite were closer, and the drop density ratio among of which was 1.1. The average gain size of Ti-magnetite and ilmenite were mainly distributed in the 212-106 μm. The liberation degree of these metal minerals were determined, the results showed that when the grinding fineness of the tailings was 1 00μm, the content of-200 mesh was accounting for 85%.According to the process mineralogy results, the process route of stage grinding and stage dressing was developed. The ore was separated by magnetic separation, the iron ore was obtained, whose grade is about 51%. The optimized direction reduction technology parameters obtained were those of the moisture content 9%, the moulding pressure of 12 MPa, the content of binding agent of 0.4%, the iron concentrate contain minus 200 mesh of 70%, the reduction time of 35min, the temperature of 1350℃, the amount of substance ratio of C and O of 1.25. Under these conditions, the metallization rate of the reduced pellets can be up to 91.77%, and whose main phase were metallic iron.In summary, the process mineralogy of Huili-Zhuqing V-Ti magnetite have been researched systematically in this paper, such as the material composition, texture and structure, the occurrence and recovered purpose minerals of major elements, the magnetism, density, particle size, liberation degree of ores, and the magnetic separation and direction reduction of iron concentrate, which can provide basis for the beneficiation process formulation of the Huili-Zhuqing V-Ti magnetite ore. |
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